Marine Fishes. Chapter 8
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1 Marine Fishes Chapter 8
2 Osteichthyes, The Bony Fish Flat bony scales (ctenoid or cycloid) protect body Ctenoid scales on Paradise Fish
3 Osteichthyes, The Bony Fish Bony operculum covers the gills (provides better protection against injury compared to gill slits for each gill)
4 Osteichthyes, The Bony Fish Lateral line used in sensory capacity and communication
5 Osteichthyes, The Bony Fish Swim bladder used for buoyancy control (some bottom dwelling fish lack swim bladder) Variable body plans are adapted for specific environments
6 Coloration Patterns: Countershading is seen in virtually all fish species In countershading, the ventral (belly) area of the fish is lighter than the dorsal area of the fish
7 Coloration Patterns This allows the fish to blend in with the environment
8 If a fish is seen from above, the darker coloration of the dorsal area blends in with the darker color of the ocean bottom If the fish is seen from below, the lighter coloration of the ventral surface blends in with the lighter coloration of the ocean surface
9 Coloration Patterns: Slower swimming fish often have bars or stripes that help break up the silhouette of a fish (a form of disruptive coloration) This helps with predator avoidance Some also have coloration that helps them blend in with environment (known as cryptic coloration)
10
11 Coloration Patterns It is also not usually to see a fish with circular patterns on or near the caudal fin This confuses predators who are not sure which end of the fish is the head
12 Coloration Patterns If the fish at right is attacked on caudal end where the black dot looks like an eye, he can probably get away with minor damage However, if he is attacked on his head region, he may sustain serious, life threatening damage Some fishes may also use color to advertise their bad taste or poisonous nature this is known as warning coloration
13 Lionfish
14 Body Shapes Vary greatly among fish dependent on the environment that fish calls home For example, flounders and soles live on the bottom and cover themselves slightly with sand to camouflage themselves from potential predators as well as prey The flat shape of the flounders and soles is well adapted to this lifestyle
15
16 Body Shapes Tuna, billfish, and other fast moving predators are long, streamlined and most of their fins serve as rudders basically (very little flexibility except in caudal fin) This body shape allows these predators to cut through the water quickly atch?v=spkjq3c_aju
17 Body Shapes The area of the body called the caudal peduncle (area just before the tail) is very thin this allows all the muscles to concentrate in this area allowing for greater thrust of the caudal (tail) fin this means FAST swimming capabilities
18 Billfish s caudal peduncle
19 Body shapes By contrast, the angelfish represents the opposite environment Angelfish and many other fish do not inhabit the open waters of the ocean like tunas and billfish do Angelfish and the like inhabit coral reefs, oyster reefs and other similar environments
20 Body shapes In these fish, the body is not as streamlined and the fins are feather-like for lots of flexibility This flexibility allows for greater control around the features that would be seen in a coral reef type environment (crevices, etc)
21 Body Shapes Other fish have a shape that allows for camouflage in their environment For example, fish like the toadfish and the stonefish actually look like rocks or scenery and thus can go undetected by predators or prey
22 Swimming Patterns Fish exhibit an s-shaped swimming pattern Bands of muscle along the body called myomeres drive this swimming motion Depending on the type of fish, different fins may be used primarily for the forward movement
23
24 Swimming Patterns In sharks, a swim bladder is absent (although there is a large lipid-rich liver to help in buoyancy) therefore, sharks tend to sink when not in motion and there is no lift from the swim bladder while swimming either While swimming, sharks are aided by the lift provided by the position and stiffness of the pectoral fins
25 Swimming Patterns In bony fish, pectoral fins are not needed for lift and thus are normally not stiff in construction (exception: fast swimming species like tuna, billfish, etc) In contrast, the pectoral fins in many bony fins are flexible and used for maneuverability
26 Swimming Patterns In some slower-swimming species, forward movement is mainly provided primarily by the pectoral fins Lumpsucker
27 Swimming Patterns In other species, all the fins may be flexible and highly modified for camouflage (example: sea horses and sea dragons) This means that the fins will not allow for significant forward movement Seahorse Sea Dragon
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